Kobelt 5022-H, Owner'S Operation, Installation & Maintenance Manual

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KOBELT MANUFACTURING CO. LTD MNL-5022-H.docx (rev A) 15
4 O
PERATION
4.1 F
UNCTIONAL
R
EQUIREMENTS
4.1.1 Pressure Supply
Hydraulic versions of the Kobelt lever disc brakes require up to 1000 psi of pressure to operate.
The pressure supply system must supply a hydraulic oil appropriate for the service conditions.
Consult the table below for approved oils.
RECOMMENDED OILS TABLE
Ambient
Temperature Range
Approved Oil Approved Brands
0…+40
o
C
[+32…+104
o
F]
ISO VG 32, VI 60 Rando HD32, Mobil DTE, Tellus S2 V 32
- 20….+20
o
C
[- 4…+68
o
F]
ISO VG 22, VI 150 Rando HDZ22, Mobil DTE10
+40….+80
o
C
[+104…+176
o
F]
ISO VG 68, VI 60 Rando HD68, Mobil DTE, Tellus S2 V 68
-40 … -20
o
C
[- 40… -4
o
F]
ISO VG 26, VI 300 Univis HVI 26, Tellus S4 VX, Hydrex MV Arctic
In all cases hydraulic circuits must have a relief valve that is set to limit the system pressure to a
maximum of 1000 psi.
4.2 S
ERVICE
L
IMITS
4.2.1 Disc Temperature
The Kobelt brake lining achieves maximum friction at 300
o
F. Over 300
o
F the brake begins to
fade or experience diminishing friction. The maximum operating temperature of the brake
linings is 700
0
F [371
0
C]. Temperatures in excess of this limit will permanently damage the
linings and require replacement.
4.2.2 Ambient Temperature
In sub-zero temperatures, ventilated discs must be warmed up gently to avoid causing excessive
thermal stresses in the disc. Failure to do so could cause the disc to crack. Once the
temperature of the disc is out of freezing condition it can be used as normally intended.
Operating temperature of standard brake actuators is -40°C [-40°F] to 120°C [248°F]